Yoga, like meat loaf and Meat Loaf, is best enjoyed hot or on a motorcycle. Melt away bad attitudes with today's Groupon: for $40, you get 20 Bikram yoga classes at Bikram Yoga Fairfax (a $360 value).

Attentive instructors, such as Siri Om Khalsa and Reggie Meneses, lead a robust schedule of 90-minute Bikram classes. Students of all fitness levels flow through a series of 26 postures and breathing exercises designed to increase flexibility, relieve stress, and prevent injury. According to Women's Health magazine, Bikram yoga classes may burn up to 636 calories per hour. Bikram Yoga Fairfax's 105-degree studio helps mat mavens work toward firmer, more malleable muscles, providing a deeper stretch and helping the body rid itself of dangerous toxins through convenient sweat droplets, leaving room for the more enjoyable toxins of the weekend. To prepare for the session, each student totes along lots of drinking water, a yoga mat, and two towels to soak up sweat and puddles of former couch potatoes. Instructors recommend wearing light, comfortable clothing, and coming to class with an empty stomach.